This crab not only sounds rock’n’roll, but looks rock’n’roll.
At about 8 cm wide, they are coloured purple or red-brown at the front, and grey or tan at the back. They have a straight, red rim along the front edge of their shell and between their eyes.
This crab has strong front and black claws, with tooth-like edges. During breeding time, a male rough rock crab will carry the female around for a few days until she moults her hard shell.